static const float4 palette[16] = {
    float4(0x00 * 255 / 63, 0x00 * 255 / 63, 0x00 * 255 / 63, 0xff) / 0xff,
    float4(0x00 * 255 / 63, 0x06 * 255 / 63, 0x1d * 255 / 63, 0xff) / 0xff,
    float4(0x04 * 255 / 63, 0x23 * 255 / 63, 0x00 * 255 / 63, 0xff) / 0xff,
    float4(0x05 * 255 / 63, 0x2e * 255 / 63, 0x34 * 255 / 63, 0xff) / 0xff,
    float4(0x1c * 255 / 63, 0x03 * 255 / 63, 0x02 * 255 / 63, 0xff) / 0xff,
    float4(0x1b * 255 / 63, 0x07 * 255 / 63, 0x27 * 255 / 63, 0xff) / 0xff,
    float4(0x2c * 255 / 63, 0x14 * 255 / 63, 0x05 * 255 / 63, 0xff) / 0xff,
    float4(0x2e * 255 / 63, 0x2c * 255 / 63, 0x2a * 255 / 63, 0xff) / 0xff,
    float4(0x12 * 255 / 63, 0x12 * 255 / 63, 0x10 * 255 / 63, 0xff) / 0xff,
    float4(0x02 * 255 / 63, 0x18 * 255 / 63, 0x31 * 255 / 63, 0xff) / 0xff,
    float4(0x26 * 255 / 63, 0x33 * 255 / 63, 0x00 * 255 / 63, 0xff) / 0xff,
    float4(0x1c * 255 / 63, 0x3d * 255 / 63, 0x35 * 255 / 63, 0xff) / 0xff,
    float4(0x3a * 255 / 63, 0x27 * 255 / 63, 0x00 * 255 / 63, 0xff) / 0xff,
    float4(0x3f * 255 / 63, 0x1e * 255 / 63, 0x36 * 255 / 63, 0xff) / 0xff,
    float4(0x3f * 255 / 63, 0x3c * 255 / 63, 0x15 * 255 / 63, 0xff) / 0xff,
    float4(0x3f * 255 / 63, 0x3f * 255 / 63, 0x3f * 255 / 63, 0xff) / 0xff,
};
